Keystones — Capstone
Five GCSE retrieval questions · 21 December 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √360
Answer: 6√10 -
2. Algebra Completing the square
Complete the square: 3x² + 12x + 2
Answer: 3(x + 2)² - 10 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 19cm, angle = 47°. Give your answer to 2 decimal places
Answer: 187.59cm² -
4. Ratio Combining two ratios
a:b is 3:5 and b:c is 9:5. Find a:b:c in its simplest form.
Answer: 27:45:25 -
5. Statistics Averages and range
Find the mean, median and range of: 28, 42, 100, 77, 42, 42, 66, 72, 35
Answer: Mean = 56, Median = 42, Range = 72